test_fontconfig_fonts error on Linux wheel testing #8152
Description
Testing the built wheel, I get the following error (using pytest):
=================================== FAILURES ===================================
__________________________ test_get_fontconfig_fonts ___________________________
[gw0] linux2 -- Python 2.7.6 /venv/bin/python2.7
@pytest.mark.skipif(sys.platform == 'win32', reason='no fontconfig on Windows')
def test_get_fontconfig_fonts():
> assert len(get_fontconfig_fonts()) > 1
E assert 0 > 1
E + where 0 = len([])
E + where [] = get_fontconfig_fonts()
https://travis-ci.org/MacPython/matplotlib-wheels/jobs/205418240#L623
Should a bare Linux container like the testing container contain any fontconfig fonts? Or is some assumption being made about the configuration of the system?